Use of progesterone is wide-spread, although little is known about the long-term effects of progesterone on the fetus and development and health of the child in later life. Therefore, we will assess the effect of prenatal exposure to progesterone on child (neuro-) development, i.e. cognition, behavior, gender identity and health in children exposed in-utero to progesterone versus placebo at 11-14 years of age.